Having finally printed a full set of arms, I tried to install the M8x60 screws. The nut traps would not take the Nyloc nuts. So, I suggest that the BOM is wrong and needs to specify 12 M8 flat nuts and 21 M8 Nyloc nuts and that the Exploded views should be updated to distinguish between Nyloc and flat nuts.

A more pertinent question is, 'Do we need Nyloc nuts, or could we replace them with a flat nut plus lock washer?'